Light-Guide Thin-Film Circuit Substrate for LCD Backlight Thickness Reduction
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels are thick due to the use of light guide plates and optical films, which occupy a significant portion of the panel's thickness, necessitating a reduction in overall thickness while maintaining efficient light output and polarized properties.
Innovation Solution
The implementation of a light-guide thin-film circuit substrate with a reflector and a polarizing layer, where the light source is positioned to enter and exit the substrate, and optional light deviating structures are used to enhance light distribution and uniformity, reducing the need for bulky components and minimizing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light guide plates and optical films are used in conventional LCD panels, then light distribution and polarized properties are achieved, but the overall panel thickness increases significantly
Solution Approach 1:
The patent combines the light guide function and circuit substrate function into a single integrated component. The circuit substrate serves dual purposes: as the structural base for mounting electronic components and as the light guide that distributes backlight across the display panel, eliminating the need for separate light guide plates and reducing overall thickness
Solution Approach 2:
The circuit substrate is designed to perform multiple functions simultaneously: it provides mechanical support for circuits and components, guides and distributes light across the panel, and can incorporate optical films for polarization and brightness enhancement, thereby reducing the number of separate components needed
2Illumination intensity
If multiple separate components (light guide plate, optical films, reflector) are used, then optical functions are achieved, but assembly complexity and labor costs increase
Solution Approach 1:
The patent merges multiple optical components into the circuit substrate structure itself. The light guide function, reflector function, and optical film integration are combined into a single substrate assembly, reducing the number of separate parts that need to be manufactured, handled, and assembled
Solution Approach 2:
The patent implements a nested structure where optical films are integrated within or onto the circuit substrate layers. The circuit substrate contains embedded light guide channels and can have optical films laminated or embedded within its structure, creating a compact multi-layer assembly that reduces overall component count
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a thinner display panel with improved light utilization efficiency and uniformity, reducing assembly labor and costs while providing polarized light as required, thus addressing the thickness and component count issues of conventional LCD panels.
Implementation Method 1
The reflector is disposed under the light-guide thin-film circuit substrate for reflecting the light leaking out of the bottom surface of the circuit substrate to enhance the light utilization efficiency
Implementation Method 2
The light produced by the light source enters the light-guide thin-film circuit substrate through the light entrance end, guided and transmitted through the light-guide thin-film circuit substrate, and then leaves the circuit substrate through the light exit top surface
Implementation Method 3
The polarizing layer is disposed on the light-guide thin-film circuit substrate and parallels the light exit top surface of the light-guide thin-film circuit substrate
Data Source
AI summary
A display panel and a light source device used therein are provided. The display panel includes a light-guide thin-film circuit substrate, a light source and a polarizing layer. The light-guide thin-film circuit substrate has a light entrance end and a light exit top surface, and the light source is disposed corresponding to the light entrance end. The polarizing layer is disposed on the light-guide thin-film circuit substrate and parallels the light exit top surface of the light-guide thin-film circuit substrate. The light produced by the light source enters the circuit substrate through the light entrance end, guided and transmitted through the circuit substrate, and then leaves the circuit substrate through the light exit top surface and enters the polarizing layer. The light after passing through the polarizing layer is turned into a polarized light having flat light source effect as a backlight source for the system.